Line control tractor



J ne 19 u 2l 27' J. w. MowBRAY LINE CONTROL TRACTOR 6 Sheets-Sheet l Filed Sept. 13. 191B OOOOOO m Nox awww,

June 21. 1927. 1,632,911

J. w. MowBRAY LINE CONTROL TRACTOR Filed Sept. 13. 1918 6 Sheets-Sheet 2 SIM vente@ flttozncca un l J e 2l 927 J. w. MowBRAY LINE CONTROL TRACTOR Sheets-Sheet 3 Filed Sept. l5. 1918 t n im /f/mw Mun,

June 2l 1927.

J. W. MOWBRAY LINE CONTROL TRACTOR Filed Sept. 13. 1918 6 Sheets-Sheet 4 glnventoz NS MS. @QN

- 1,632, l] June 2l, 1927- J w, MowBRAY 9 LI NE CONTROL TRACTOR Filed Sept. 13. 1918 6 Sheets-Sheet 5 O 70 I g t al. BMJ/w/ anciana,

1,632,911 June 21 1927' J. w. MowBRAY LINE CONTROL TRACTOR Filed Sept. 13. 1918 6 Sheets-Sheet 6 awo/mu,

Patented .lune 21, 1927.

UNITED STATES PATENT OFFICE.

JAMES W. MOWBRAY, OF WINDSOR, ONTARIO, CANADA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE AUTOMOTIVE CORPORATION, OF FORT WAYNE, INDIANA, A COR- PoRA'rIoN oF DELAWARE.

LINE CONTROL TRACTOR.

Application file d September', 1918. Serial No. 253,857.

T his invention relates to tractors, and its object is to provide a. simple and efficient tractor of two-wheeled type adapted to oper` ate as a draft apparatus in the drawing of loads or other vehicles, or4 for drawing apparatus of various types as, for instance, plows or other farm devices. The 'primary object of the invention is to provide a means for controlling the operationofthe tractor from a distance as lfor instance by an operator on the load or device drawn thereby. In the usual tractor the operator is positioned on the apparatus and provided with the various foot and hand levers for controlling the speed of operation of the device or its direction of movement, etc.l In the device herein disclosed, all the devices on the tractor to be controlled, for instance the throttle, speed of operation of the lengine, or speed of movement of the vehicle through control of the power transmission apparatus and its direction of movement are operated solely b vapair of lines through and by means of which the tractor may be made to advance or back up, to operateat'v'ario'us engine speeds, and various speedsof travel and is guided in its movement at the will of the operator.

Various features of the invention are involved in the means employed whereby 'the pair of lines may be depended upon to lcontrol the device in the manner stated. Further objects of the invention are involved in the means employed in steering the tractor, and these and other various novel features of the invention and the construction of the various controlled parts are hereinafter more fully described and claimed and shown in the accompanying drawings 'in which- Fig. 1 is a plan view ing my invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is an enlarged side elevation, partly in section, showing the various controlled parts. l

Fig. 4 is a plan View thereof.

Fig. 5 is a detail of the means in guiding the machine.

Fig. 6 is a detail of one of the controlled parts used in shifting the gears and transllllfSlOll Case.

Fig. 7 is an elevation of the lever for controlling the sliding gear of the transmission when set in operative position.

ofk a tractor embodyemployed mainiframe 3, the side members of which form half circle at the rear end 4 which is provided with rack teethl 41 'utili-*Zed in steering the apparatus as is hereinafter described. This frame is mountedupoii a wheel axle 6 having the wheels 7,7 on opposite sides of the frame 'for driving the apparatus.

Theaxle'is a two-part aXleand', as will be understood from 'tflie-Iigzg. 3a differential gear-group' of thefusualtype interposed betweeny the adjacent ends thereof driven by a bevel gear 6 mounted on a-shaft 7at carried in bearings in-a casing 8 which incloses the differential gear group 5 and is supported on the frame of the machine by means of a cross member9 shown clearly in Fi 4, which 'cross member is connectedfwith the rear of the casing 8, atV which point the casing is provided with a vertical chamber 10. I n -this chamber is 'a spur gear on the shaft 7 which meshes with a'smaller gear 12 on lan idler shaft on which is also secured a large gear 13 meshing with a gear 14 on a drive shaft 15. This drive shaft- 15 is connected by means of transmission mechanism (not shown) in the case 16 and is operated through the usual gear train by means of a shaft 17 in alignment therewith, on the forward end of which is mounted a clutch member 18, a companion member of which is formed in the fly-wheel 19 of the internal combustion engine, which fly-wheel is connected on the crank shaft 20, a portion of which `only is shown in Fig. 3. With the clutch 18 in engagement with the companion member, wheels are thus driven through the gear train vdescribed and differential gear group 5, and the operation of the clutch member and the transmission mechanism is hereinafter described.

Pivotally mounted on the rear of the casing 8by means of the stub shafts 21 and 22 at the upper and lower end of the vertical chamber 10 is a yoke 22 which is provided with a rearwardly extending bar 23 as shown more the bar and the bar attached to'itheapparatus or device-tor. be drawn.'v When :not connected .with any ,apparatus the shoe is utilized `to hold the bar .inhorizontal; position. @gg-The purposehfj pivotallyonneeting the yoke. l.Withfthecasing. or relative to the; frame ofthe machineisutaenable thefemachine to be .guided ijn .-its gmove'mentf,and.` thisl is accomplished'by mechanism-Showinrnore clearly in detail.- in'i EigS.3iand 4-. 'AsW'rl-l be seen particularly. in 1]? 3,,theupper-stub, shaft 21 hasa seeondgshaft 28, indieatedsby-dottecl lines. secured-.at'sth-e. :upgperj end thereof, and oir/.this extension 28 isa worm-gear29 having asleeve 30,;andn2-tliis.sleeveis mounted a Vsprocket Wheel 31.. whereby;, thedrivin-g of the Worm,` gear 29 drives thei sprocket .Wheel'. The Worm'..wheel'isdri.ven byvlllnfeans of a worm` .Wheel 32 on i a nshal'tf33-, vv{hic -,h Ishaft is driven'by the engine in Yagma-nner, hereinafter is mounted -inav case havingyaw Abase member 34 adaptedto swingoni the shaft 21 .as a pivot and is provided @with ears34a by means of which the cap memberof thecase 35 may besecured to thebase member 34. Thisicap member-35 isprovidedmith a-slot36 through which the shaft 33 projects, `thegslot-,being of-suliicie'nt length-to allowthecase to swing in either direction-on the pivot of the shaft- 21. Thesprocket ,31 isconnected by means of a vchain 37 with a similar sprocket 38 on the. vertical shaft 3 9 which has a .gear 40. on the lower end, thereof meshing with the internal rack on theI circular end of lthe main frame 4. By operation of the Worm wheel 29 the shaft 39. isA rotated and the gear .made to traverse the rack 41 in either direction depenlding upon the direction of rotation .of the Worm wheel 29. This tends to siving 'the bar1 on its pivot, or ratherv the frame of the machine by reason ofthe bar being attached to a load of some character turns relative to the bar andthusthe machine is `s fuided in its movement, the machine beingturned by the power derived from the engine that is in fact a power steeringapparatus, and the .drive wheels being differentially driven, as described,.the machine turns with each'in either direction.

As previously stated, the machine is controlled solely by a pair of lines 42 and 43.

. witha forward cross bar 47.

`Wheel 51 secured to the shaft.

dottedli-nes ,in Fig. 5, the stub shaft 48 and this cross bar 1s connected at. each end .rspeetively lay. means .0f a .Spring- 45.311446 This cross bar 47 is pivotallymounted on a stud 48 having a bifurcated end 49, and the said ends are apertur'edto receive a shaft 50. On this ,Shaft between thefurcations is a ratchet- As shown in ait ,the bifurea'ted'end is ,provided vwith a spring latch or --pawl 48a .engaging the 'ratchetvsothat movement of. the shaft 48 about-the shaft 50 as a pivot turns the shaft 5 0. :This shaft; 50.is carried at the upper endofabraeket 52 .which may be mounted in any-.convenient manneronthe transmissioncase orsome .-portionthereof as indicated. in-.F.ig.3and on the inner end the shaftjis-p'rotvid-ed with a star Wheel 53, the points of the s tar being notched as indicated at154. Engaging with the starwheel is the pointed ende-of a .lever55 pivoted in the transmissioncasing as shown in Fig. 3, the lower. end ,of which, is :forked to engage a groove inthehirb-.ofthe clutch member 18. vIt willi be. rimedi-that, in .the a position, the Wheel 53wWit-h'` the., point 56-engaginrcgA at .the point of Lone tooth-of lthe star Wheehthe clutch member-18 is held out of engagement With.its companionA in the fly-Wheel. 19. It ,the ratchet ,Wheel be movedby the turning-of the shaft() -the point 56 .Wi ll enga-ge at the lowestfpoint between the-twoarms 0r teeth of'iliestarwheel allowing the clutch 18 Ato moveinto engagement with itsl companion b v reason ofthe operation ofthe,spring 5'? Qn the shaft 17. Thus by moving the stub shaft'48rhiving the bifurcated end, the star .wheel ,isintermit'tently turned by movement backward-of the-stub shaft 48 from the position shown in Eig., i3 allowing thel nose or point l56 to drop, between two teeth and engaging, the clutch member 18 with its .companion ,thus connec'tingthe engine with the power transmission.,mechanism and drivinry thejvheels If the shaft 48 he again rotated or turned, a succeeding-point Iof the star Wheel forces the lever to assume original position asshownin Fig. 3, .and thus after movement of the stub shaft 48. and hitur cated end.49 thereon actuates the star wheel andsuc'eessively engages the clutch members.

'Ehisshaft 48 is turned by pulling on the lines 42 and 43 equally'. As is hereinaftei` shown, there is. ,a spring utilized to turn the shaft 48 aboutgthe shaft 5() on release ot' pressure on the lines 42 and 43. It Wiil thus beseen. that With theengine in operation and thehparts inthe .normalposition shown in Fig. 3, simply pulling up on the two lines 42 and 43 Willplace the clutch 18 into engagement with its companion 19, whereupon the power will be transmitted to the driving Wheel. Mounted at the rear of the transmission casing 16 is a bracket 58 having a shaft 59 mounted therein similar in all respects to the shaft 50. This shaft is provided also with a star wheel 60 at one end and a ratchet 61 at the other, which ratchet engaged by the hifurcated end of the shaft or lever 62 in the same manner as with the stub shaft or lever 48. 'Ihis lever is connected by means of a pivoted bar 63 with a chain 64 to the erossbar 44. This connection allows some backward movement of the bar 44 prior to the time it will become' taut and turn the lever 62 about the shaft `59 and operate the ratchet thereon so that in first pulling on the lines the lever or vsliaft 48 is turned to the limit of its movement, and this movement of the shaft or lever 48 may be limited in `vcrious "ways as for instance by making one end of the furcationsl longer than the other, as is'indicated at`65, which would engage with a pin on the supporting bracket 52.v lVhen the shaft 48 has thus been stopped in its movement, the springs allow the lines to still be drawn backward vand operate the lever 62. The star wheel 60 has the points thereof notched at 66 in the same manner as the star wheel 53 Iand a Alever 67 has a nose or point 68 adapted toengage the said notches orto engage the teeth at the base thereof as is indicated in Figs. 7 and 8.' 'This' lever 67 is.' pivoted at 69 to the bracket, and the lower end has pivotally connected therewith a Vbar'70. Although not so shown, it is to be understood that the bar Ol is connected with a sliding gear within the transmission case 16 and with the parts shown the gear isin forward driving-position. When the star`wheel 60 has been turned, however, so that the nose 68 drops between the teeth, which is occasioned by the action of the spring 7l on the bar 70, the reverse gea-r is drawn to operative position in the transmission mechanism and reverses the direction of movement of the shaft 15 and consequently of shaft 7EL and driving wheels operatively connected therewith. This lever 62 at the bifurcated end, as indicated in Fig. 6, is provided with an elongated arm which engages the pin 76 as with the lever or shaft 48 heretofore described which limits its backward movement by means of the lines. The lever 62 upon release of the lines, is moved forward by means of the spring 77. Upon forward or idle movement of both the levers 48 and 62 by the respective springs, the shafts 50 and 59 are held from being turned with the levers as the shafts are sufficiently restrained by reason of the yieldableengagement of the levers 55 and 67 with the star wheels for the respective shafts. Thus, if the lever 48 be moved to turn the star wheel and the lines released, the lever 48 turns backward to position to be again operated, leaving the star wheel and a lever engaging therewith in its set position thus requiring a successive pull ou the lines toA change the relationship of the parts.

l't is to be noted that, by succeeding operations of the lever 48, the star moves the lever 55 to cause the clutch 18 to move alternately to engagement with and disengagement from its companion iu the fly `wheel 19. It is also to be understood that the successive movements of the lever 62 by the'lines alternately sets the shift gear for reverse and forward driving of the vehicle. In the position of the parts shown in Fig. 3, the 'clutch l18'is disengaged and the shift gear isi-nreverse position. Release of the lines and a succeeding short pull will release/the levez' 55 and engage the clutch and thereby cause'backward movement of the vehicle. yIf it is then desired to move forward, it'will be necessary to shiftthe gear, at-which 1time it is also necessary that'the clutch member be disengaged. To accomplishthis, the operator first draws the lever 48 Ybackward which 'disengages thevclutch and'whilel the Ilever 48 is drawn backward to effect-this'result', the lines are continued to be'pulled untiltheflever 62 isactuated which causes the star wheel 60 to be moved perinitting'the point of the lever 67 to -en gage between the'teeth thereof thereby positioning the shift gear in the forward driving position. -Thereupom the lines may be released permittingthe levers 62 and 48 to return to normal position by their respective springs. The lever 48 is then again actuated to permit the point 56 of the lever 55 to drop between the points of the star wheel 53 thus permitting engagement of the clutch. If it is desired to stop the machine, a pull on the lines brings the succeeding point of the star wheel 53 to engagement with the point 56 of the lever 55 thereby withdrawing the clutch. Thus, the machine may be started or stopped by a pull on both lines, and itis only after the clutch is disengaged as above stated, that the shift gear may be moved by a further continued pull ou the lines. The shift gear is not here shown in detail, it being of a familiar and well known character, but itis to be understood that various types of gear shift devices may be used capable of being operated by a star wheel after the manner herein disclosed.

As with usual internal combustion engines, a carburetor 80 is provided having a throttle valve controlled by a. lever 81 of any approved form. This lever may be connected by means of a spring 82 with the shaft or lever 48 so that on advancing the said lever to start the engine the throttle is opened and the engine speeded up, and upon release of the lines preparato-ry to withdrawing the clutch, the throttle is closed. The closing operation of the throttle 1s performed by means of a spring (not here wheel shown) as is usual with ordinary construction now commonly known. It is thus to be seen that by simply pulling up on the lines the throttle is opened, the engine speeded up, the transmission mechanism connected therewith to drive the machine forward or in reverse direction as may be decided upon. By simply maintaining the pull upon the lines, the throttle is maintained open and the engine operating at full speed. If it be desired to. lessen the engines speed a slight release on the lines will operate the throttle to lessen the engine speed.

The machine is also guided by the lines. If it be desired to turn to the right or to the left the corresponding line 1s pulled upon. This turns the bar 47 on the shaft 48 turning the lever 47 on its pivot, drawing the arm 90 to the right or left as the case may be, which arm is pivoted to the bar to swing in a vertical plane and is moved in a horizontal plane .by reason of rotation of the arm as stated. This arm 90 has an apertured end torwhieh is connected a shifting lever 91 of the clutch mechanism of which there are two similar members 92 and 93 slidable on a shaft 94, which shaft is carried in a yoke 95 supported on top of the engine as shown clearly in Fig. 3. This yoke supports a horizontal shaft 96 positioned at a right angle to the shaft 94 and this shaft 96 is connected'by means of a universal joint 97 with the shaft 33 on which is positioned the worm 32 meshing with the worm wheel 29. On the inner end of the shaft 96 is a bevel gear 98 continuously in mesh on opposite sides with a bevel gear 99 and 100. Both these gears have a coned face corresponding to the cone faces of the clutch members 92 and 93 forming companion clutch members respectively therewith. These gears 99 and 100 are loose on the shaft and on movement of the lever 90 to throw the clutch 92 in engagement with the companion gear 99, the said gear is made to rotate the shaft 94 and to rotate the bevel gear 98 in one direction whereas movement of the gear clutch face into engagement with the companion gear A100 rotates the gear 98 in the opposite direction and thus thc gear rotates in one d1- rcction or the other and is made to traverse the rack 41 to guide the machine in a manner heretofore described. The shaft 94 may be driven in any convenient manner from some point on the engine preferably by means of the shaft 101 positioned parallel with the framework of the machine properly supported relative thereto. At the forward end is provided a sprocket wheel driven by means of a sprocket wheel 102 driven from the forward end of the engine crank shaft. At the opposite end of the shaft is a worm 103 meshing with a worm wheel 104 on the shaft 94 by means of which the same is continuously driven.. By this meansI the machine may be guided to the right or left simply by pulling upon the corresponding line. Inasmuch as the pull upon one line does not actuate the lever 48 or 62 on their pivots the position of the said levers is not altered and, therefore, the machine may be guided without altering the relationship of the parts controlled by the said levers. The

operation of the gear 40 in the rack 41 turns the body of the vehicle relative to the bar 23 in the relationship shown by dotted lines in Fig. 1 although, instead of the bar being turned as would be naturally understood from Jthe dra-wing, the machine is turned relative to the bar as the bar is usually connected with. a load and in fact at all times by reason of the shoe which rides on the ground surface, if the device be unconnected with a load, sufficient resistance exists to prevent side movement in making the desired turns of the vehicle.

Preferably to prevent too sudden engagement of the clutch member 18 with its companion in the fly wheel 19 of the engine, the lever is provided with a dash pot 155. The cylinder is filled with oil and a piston is reciprocable thereon. The piston has a small aperture 157 therethrough through which oil may pass slowly on movement of the piston. The piston is also provided with a channel 158 closable by a ball valve 159. Gn movement of the piston toward the bottom vof the cylinder the ball valve closes preventing rapid movement of the piston in one direction and opening and allowing rapid movement in the other direction. The piston is provided with a stem 160 having a bifurcated end engaging about the lever 55 as shown in Fig. 5. A pin 161 is inserted through this bifurcated end and through the slot 162 in the lever. This slot is provided to allow the stem .to move in a straight line while the lever turns upon its pivot.

In the position of the parts shown in Fig. 9 the lever is in the position when the clutch 18 is withdrawn and the engine disconnected with the driven parts. Upon turning thc star wheel 53 lto allow the point 56 of the lever to engage between the two arms of the star wheel (which movement is caused by the spring 57) the dash pot device prevents sudden movement of the lever and the clutch 18 moves into engagement gradually and without jar which would tend to stall the motor. The dash pot is therefore a safety device and auton'iatically cares for gradual engagement of the clutch 18 on operation of the lines to start the vehicle. lVith the clutch in engagement the star wheel mai`v be operated to the position shown in Fig. 9 and this movement is practically unrestricted by reason of use of the ball valve which opens on movement of the piston 156 to the right of the figure.

From the foregoingv description it becomes evident that the operation of the motor vehicle is controlled solely by the two lines and that the vehicle may be driven from a drawn load as easily and etiiciently as with other types of vehicles in which the driver actuates the various control levers directly by hand `to set the parts in necessary relation to produce the desired result in operation.

It is furthermore evident that the tractor herein described is simple in construction comparatively inexpensive and that the device may be operated'by one practically unfamiliar with the character of mechanism described by simply learning to manipulate the lines in a manner quite analogous to the manipulation of lines in driving a horse. In fact the main purpose of the method of control herein described is to enable the device to be controlled from a distance by vpersons having little knowledge of the` mechanism controlled thereby. i'

Having thus fully described my invention and its mode -of operation what 'I claim and desire to secure by Letters'Patent. offthe United States isl. In a tractor, a power plant and-driving mechanism therefor, a clutch interposed between the power plant and driving mechanism for connecting or disconnecting the same, control mechanism for operating the `clutch comprising a line or cable for operating the mechanism from a distance, a lever for actuating the clutch to which the line, is connected, a spring adapted tocauseengagement of the clutch, a dash potrestricting movement of the lever by -the spring Whereby gradual engagement of,V the clutch bythe spring is automatically produced, and means whereby succeeding pulls onthe line altermately moves the lever to disengage the. clutch and releases it to action by the spring.

2. 'In a tractor, a power plant and driving mechanism therefor, a clutch interposed between the power plant and driving mechanism for connecting or disconnecting the same, a speed control for advancing or retarding the speed of operation of the power plant, and control mechanism for operating the clutch comprising a line for actuating the mechanism from a distance, means whereby succeeding pulls on the line altermately engages and disengages the clutch, and a connection between the line and speed control mechanism whereby a pull on the line increases the speed of the power plant and a release of the line .decreases the speed of operation of the power plant.

3. In a tractor, a power plant and power transmission mechanism, driving mechanism operatively connected with the transmission mechanism, a clutch interposed between the power plantand transmission mechanism for connecting or disconnecting the same, a control mechanism for operating the clutch comprising a. line, a lever controlling the clutch to which the line is connected, means whereby succeeding pulls on the line actuates the lever to alternately engage and disengage the clutch, the transmission mechanism being normally adapted to operate the driving mechanism to drive the machine in a forward direction, a reverse gear forming .part of the transmission mechanism, a lever vfor moving the reverse gear into and out of operative relation with the transmission mechanism, a spring for moving lthe lever in one direction, meansconnecting the lever with the line in a-manner to allow vthe line to be pulled to first-operate the clutch control lever and thereafter by continued pulling of the line actuate;the

reverse gear -lever to engageor disengage the reverse-gear.

4. In a tractor, a power plant, power transmission mechanism,- driving mechanism operatively connected with thel transmission mechamsm, a clutch interposedv between the power plant and transmission mechanism' for connecting o r disconnecting the same, a 'lever controlling operation ofthe clutch, a line having a yieldable connection with the said lever, said lever being limited in its movement whereby on pulling the lineja'nd the lever reaching the limit of its movement, said line may be continued in movement due to the yieldable means, reverse gear adapted to be brought into and out of operative rela-.- tion with the transmission mechanism, a' lever controlling operation of the reverse gear, said lever having connection with the said line, there being ,lost motion in the said connectionl whereby the clutchcontrolling lever may first be brought to its limited position by pulling onthe line and further movement of the line thereafter actuate the reverse gear lever.

5. In a tractor, a power plant and driving mechanism therefor, a steering means adapted to be actuated by the power plant, a clutch interposed between the power plant and driving mechanism for connecting or disconnecting v the same, a lever controlling actuation of the clutch to alternately engage and disenga 'e the same, a member having arms rotatab y mounted on the said lever, a line attached to each arm, whereby an equal pull on both lines actuates the clutch control lever and a pull upon one line or the other turns the rotatable member, an arm connected with the said rotatable member adapted upon turning in one direction to apply the power of the power plant to steer the machine in one direction and upon the rotatable member being turned in the op posite direction to apply the power to turn the machine in the opposite direction.

6. In a tractor, a power plant and driving mechanism therefor, steering means normally disconnected with and adapted to be actuated by thepower plant, means for ap` nism, a pivoted lever adapted upon successivemovements to alternately cause engagement .and disengagement of the clutch, a member rotatably; mounted on the lever, a pair of linesV connected to .opposite sides of said member whereby pulling upon one` line turns the member and pulling upon both \ines turns the lever. on its pivot, andv meansy whereby the turning ofthe said member :in one direction or the other applies the power to correspondingly steer the machine.

7. In a tractor, a power plant,l power transmission mechanism, drivingmechanism connected with-.the transmission mechanism, a lever limited in movement 4and adaptedv uponsucceeding-actuations to alternately causeengagement andV disengagement oftheclutch, steering means adapted 'to be` actuated by the powerplant and being normally disconnectedV therewith; a member rotatably mounted on'the lever, means wherebythe turning ofthe member in one direction or the other applies the power to corresponding-ly actuate the steering means, a pai-r of-linesl having-fa` yieldableconnectionwith the said-rotatable element wherebyupon pulling both .Il-ines the lever' may be turned .or upon pulling either line the power is 'correspondingly' applied toA the steering means, .a reverse gearin the transmission mechanism, a lever controllingoperation of thefreverse' gear, a slackA connection between thesaidreverse gear leverand' the Said lines, the slack allowingthe lines-to-be'drawn ta'ut to actuate the clutchcontrolling-lever and thereafter by continued' movement allowable by the yielda-ble connection of the lines, actuate the reverse gear lever.

8. In a tractor, van internal combustion engine providing a Powerplant, driving mech# anism for the tractor, steeringmeans adapted to be actuated bythe engine, a clutch interposed between the power plant. and driving mechanism, a lever-controlling actuation of theclutch to alternately engage and disengage the same by' successive actuations thereof, a member having arms rotatably mounted on the lever, a line attached to each arm, the construction being such that an equal pull on both lines actuates thelever and a pull upon either line turns the rotatable member, said power plant being normally disconnected from the' steering mea-ns, an arm connected with the rotatable member adapted upon turning thereof in one direction or the other to apply the power of the powerplant to correspondingly steer the machine, a throttle for controlling the speed of the engine, said throttle being yieldably connected with the clutch control lever whereby upon pulling of the lines the throttle may be opened and upon release ofthe lines the throttle may be closed.

9. In a tractor, a frame-work, a power plant, a pair of driving wheels supporting the frame-work, power transmission mechan. axis in alignment with the axis of the yoke, means whereby rotation of the worm wheel rotates the said gear, a worm-for oper- Vating the worm wheel, a gear for rotating the worm, means for applying the power to rotate the said gear in one direction or the other,a pivoted lever controlling actuation of the clutch 4toY alternately engage-and disengage the-same by successive movement on its pivot, a rotatable element on the said lever having an arm engaging the power applying means, the arra-ngement being such that turning the element -inone direction or the other corresponding-ly applies the power to aotuate the said gear, a pair of lines connected with the said rotatable elementby means of-which the pivoted lever may be turned by pulling both lines and the rotatable-'element may be turned by excess strain on either line.

10. In a tractor, a framework, a power plant, a pair of differentially operable driving wheels supporting the power plant and framework, a clutch device for connecting and disconnecting the power plant and driving wheels, a gear segment at the rear of the framework, a draft bar pivotally mounted to swing on a vertical axis coinciding with the axis of the segment, a gear rotatably supported in fixed relation with the draft bar and meshing with the segment, a power steering element, and a control device including a pair of lines, the said control device including means whereby pull ing on either line correspondingly applies the power to the steering element, and means whereby successive pulls on both lines simultaneously causes engagement and disengagement of the clutch.

11. In a. tractor, the combination with a power element, a speed changing power transmission'device and a steering element, of a control means therefor comprising a pair of lines, a control member to which the lines are connect-ed, means whereby a pull -on either line independently correspondingly actuates the steering element, means whereby successive pulls on both lines simultaneously alternately connects and disconnects the power element and the transmission device, and means whereby n pull on both lines simuitaneousiy to an extent greater than is required to connect or disconnect the power eieniem el'eets clisrnge in the speed changing; power transmission eiement.

12. In a tractor, the combination with a pewter element, a speed changing power transmission device, e clutch therebetv-:een and the steering` element, of control ineens therefor comprising' two lines, mechanism connected therewith adapted by a pull upon either line to affect the steering, means adapted by successive independent pulls upon both lines to aiterneteiy connect and disconnect the clutch. and mechanism independently connected with the lines adapted to effect a change in the speed changing power trunsn'iission element by a pull on both lines to an extent greater than is required to disconnect the clutch.

In testimony whereof, I sign this specification.

JAMES vW. MOVBRAY. 

